observe the modern periodic table and explain the gradation in reactivity of halogen family
Answers
Atoms of elements consist of a nucleus that contains protons and neutrons. The nucleus is surrounded by electrons that move around in orbits, or levels. Atoms of an element react with other atoms based on the number of electrons found in their outer orbit. These outer electrons are called valence electrons. For an atom of an element to be nonreactive, it must have eight electrons in its outer level. All members of the halogen family have seven valence electrons.
Because these atoms are so close to having a full set of eight valence electrons, they're very reactive. They show a chemical tendency to gain one electron by forming bonds and taking the electron from other atoms to attain a full set. Because of their chemical reactivity, these elements do not exist as single elements in nature. They are only found in compounds.
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